Radial drill



Mmh 1 1927.

J. c. CARLTON RADIAL DRILL March l 1927. 1,619,190

' -J C. CARLTON v RADIAL DRILL Filed Aug. 18, 1922 2 Sheets-Sheet 2 Patented Mar. 1, 1927.

.lylihltt uni-ren stares Parleur or-Fics;

JACK C. CARLTON, OF CINCINNATI, OHIO, ASSIGNOR T0 THE CARLTON MACHINE TOOL COMPANY, OF CINCINNATI, OHIO, A CORPORATIONOF OHIO.

RADIAL DRILL.Y

Application le'd August 18, 1922. cria-l. No. 582,751.

This Ainvention relates `to drilling ma-v chines, and in particular to improvements in a type of machine known as a radial drill, employing -a column for supporting an arm radiating horizontally thereon, the arm carrying a drill and adapted to be .elevated vand 'lowered andv swung labout the column. In such machines thearm is usually mounted upon a sleeve engaged over the column upon which the arm is elevated or lowered and the sleeve revolvable about the column -to provide for the swing ofthe arm. The column, on Aaccount of the weight and working strainsy ofthe arnninust vpossess a requisite degree of rigidity to adequately resist the bending stresses to which it is subjected, and many efforts have been made to strengthen `the structure without unduly adding to the weight of the column. Also to the method of mounting the sleeve so that Vit may Ebe freely revolvable about the column, which however has not been suocessfully accomplish'ed -in types .in which thebase of the `sleeve is split for contracr tion for binding the sleeve tothe column,

which destroys the equilibrium of the sleeve upon the column and results in undue frictional resistance between the sleeve vand column in al rotative capacit-y when the sleeve ,is unclamp'ed from the column. f

InV machine tools of this 4classwhere the prime vpower transmission is loc'atet'l at the base ofthe colli-mn it is necessary -to extend a shaft Centrally through the column in connecting with transmission gearing at the head of .the sleeve so `as to revolve with `the sleeve and which ltransmits motion to a ver? tical shaft outside of rthe sleeve for Vconnecting with the transmission gearing lcarried by the arm, `for transmitting the drill upon the arm. On .account of the length of the column it is only possible to provide bearingsV at the opposite ends of the column for the 'shaft centrally engaged therethrough. The shaft is .therefore free to vibrate yintermediate its bearing, causing it vto run untrue, and causing injury'to the gears connecting with the opposite ends of the shaft. Vln the present invent-ion the gearings Vat the `bottom Vand top of the column are organized Vas self-contained r`removable units, transmit'tingly yconnected by the column shaft, which is' looselyv engaged within Ythe column and inY bearings of the transmission units. Under such conditions the gearing of the several units may be sustained in an loil 'bath and features rendered available for elimiHating conditions 'reducing the eiliciency andk durability of the machine. n

An object of t-he invention is to reduce the weight ofthe column of the drill and at the `same time maintain vcolumn rigidity, this object being accomplished by reinforcing ythe interior of the hollowr column. with a plurality -ofV ribs or iutes .extending longitudinally thereof, substantially from bottom to top.

Another object of the invention is to prevent the transmission gears, at the ybottom of the column .connecting with the central driving or power shaft, from Arunning :out of true, :and to correspondingly eliminate :the noise vincidentV to such a condition; this object being furth'ered vby mounting the gears yin a casing attached toy the 'bottom :of the column, Ythe power shaft being slid-ably connected with one of the transmission gears therewithin, and to support the lower end of the shaft in a ball bearing footstep.

Another object of the invention is to provide forr the removal of the lower tra-nsmission gears for `repair vor adjustment, without disassemblino the drill, this tobject, being accomplished by providiznga transmission casing at the bottom of the column, removable through an. opening in the side of.` thefsame, the shaft being translatable within and removable fromone ofthe transmission gears within said casing.

Another' object ofthe invention is to providekan oil reservoir about the `transmission gearing7 and to further provide .a sight opening through which the oil level therewithin may be ascertained. y Y Another object 'of' the.y invention is the provision vof means attached to theV sleeve for rotatablyv` suspending the same about the. columin said sleeve having mounted thereon 'the :usual translatable' work-armi.

l@ther objects and certain advantages will be more fully set forth in a description of the accompanying drawings forming apart of this application,' and in the drawings like characters yof reference Vdenote correposed lbetween the'base and'sleeve. Upward ymovement of the sleeve is prevented by screws projected into a groove 16o-fthe column or base. Means ,for fastening -the sleeve against `rotation consists of e-.x-pansble bands '17 surrounding thecounte-rturned portion 13 and interposed between the sleeve yand tba-se, said bands 1be-ing 4expanded by 'the oscillating vmember y13 which is Vconnected `-by the `p'itman '19 to the crank '20 mounted on `power shaft 2L n "The shaft `21 .may be turned in opposite directions `respectively to expander contract Vthe bands and correspondingly clamp and unclamp the sleeve, Mounted within the column is a Heating driving 'or power shaft disposed vertically therein, the shaft being lutted or ribbed throughout a portion yof its length at each end as at 31, 32, -to provide keys .engagealole' with corresponding grooves -ot' the sleeveof fthe gear 33 and gea-r 34 respectively of the, gear transmission unit yupon zthesleeveS at the top thereof and Within the base ott the column at its-bottom. vThe llower `gear 'transmission unit comprising gear 34 ismounted within a casi-ng and oil reservoir attached by vscrews 3G to the bottom ot the V'base or column, .said vcasing having a cy-lindricalv extension 33 projecting through an opening 39 nin th-e base ot the Vvcolumn and extending beyond the column. The opening 39 iso su'tlicient size to allowv the removal .of the casing therethrough. LkThe r`bevei'lle-d gear 34 is mounted in ball bearings 40, 4l, onemember of ,the l-)earring 4l bei-ng Y heldin a cap-plate or cover lQ/-att-ached by suitable `fastening .devices to the casing 35, the other member o'l'the bearing'being fitted `upon `the "hub Vextension 4-13 of the gear, the extension and gear being bored and milled 'to 'provide multiple spline grooves 4% into "which tit the .corresponding spline rribs 32 of the shaft 30. The grooves extend part Way through thev gear7 Vsaid gear being l-provided With Aa lower sleeve or hub extension into which is tightly iitted the counterturned fportifon 46 vot'afstub shaft 47,'-tlie lower end of which shaft 4engages :the innerl rin-g voit vthe bearing 40, and said lslia'iftris provided Vwith a screw `extension i8 having a mit 49 .engaged against the :inner ring as a securing means, the stub sli-att 47 and 'gear forming a vfoot-step vupon which the driving shaft-303m supported. The outer ring ot the bearing 44C is seated nithin a socket of the casing 33gY said socket formed in an upwardly project- -ing .portion 50. yThe casing 35 is closed and' sealed to ginovide van oil reservoir which may Ibeli'l'led through `a suitable opening in the Ventension 38, closed by plug 51, A passage 52 is provided through which the oi-l kmay reachtheflower bearing 40. f

Tn mesh with the bevelled gear 34 is a second bevelled gear `jkeyed to a driving -`shaft '6l mounted horizontally in bearings Aen. in suitable bearings 496 carried by combined 62, 63, said sha-ft projecting beyond the end Wall of 'the extension. The bear-ing '62 is mounted in t'he division Wall 6a, oil :com- `Inunication being provided between the casing and the extension by the Vopening 65. The bearing 63 is mounted in the outer Wall 66 `of the extension, and a clutch :mein-V fber 67 is keyed to the: outer send vof the shaft beyond the outer wall of said extension. The clutch member has a lreduced sleeve portion 68 rotatively engaged 'by a cap-plate :69 attached by screws to the end of the casing, said plate providing .a packing-receiving groove 270 the packing of which engages the sleeve 68 to prevent the egress'lot' oil. Translative movement of the clutch member is prevented by a nut 72 having threaded engagement With the cor-- rresponding extension 'of the shaft. An -oi'l sight opening 73Vis provided in the lower? grooves vof the sleeve 80 upon which thevgear 33 is keyed, said sleeve being supported in bearings 81, 82, stepped respectively in vthe Vlower-Wall of the combinedcap, .oil reservoir, and gear housing 83, and ma bearing-plate' 84a suitaby attached 'to the interior' -side Walls oi the housing. The combined cap and n'eservoir is attached to the upper enduit sleeve Vby suitable fastening devices 85 traversing 4an annular flange at the bottom of the reservoir only one of said fastening vdevices being shoW-n. The reservoir houses advdltional gears 86, 37, in train ywith Athe gear 33, said gears being mountedin bearings 38, 39, and 191. A casing or housing cover 34 is provided with a filling openingthrough which oil may be introduced. Passagesare provided in the bottom of the reservoirleadingrespectivelyito the bearings fS'l, 88 and 90. `'ln splined connection with the sleevef92 of the gear "37, the mounting of this fgear being similar-to that of gea-r 33, is a shaft which has multiple ispline ribs'95a there- The lower end ofthe-shaft 95 is stepped oil reservoir. and bracket i97 attached "to the sleeve near lits loiver port-ion. s This reservoir provi-des [means for oiling the bearing 96, a sight opening valso being provided therefor as in the case lof `the transmission casing. Shaft '95 has splined connection with the driving gear (not shot-vn) of .a speed box" 9S attached 'to the drill or Work arm 11.

' (See Figure'Q).

The splined connection of the shaft- With the gears 33, 34, permits the shaft to be llG raised suilicientlyl to disconnect the lower end/1311i@ `of the` column.

thereof from the gear 323 and easing 35, the rover 8l first having been renioved, to allow theiremoval of the transmissitm casing for adjustment or repair of the transmission mechanism therein. The novel mounting of the shaft rn'events undue wearing ot` the gears 3l and (S0` the gear -l-lheilig mounted Vin a separate bearing` instead ol upon `the shaft, so that the whipping action of the shaft dees not throw the gear out of alignment, as happens in the old constructions. The gearing moirover.` more easily removed for .repairs or adjustment by simpl;7 raising the shaft to disengage the lower end from the gear 23E-t.

. Providing the radial arm carrying sleeve S withv a headedend as an integral part of the sleeve. the sleeve directly suspended `from the top of the column. which renders `the sleeve more stable upon the column than if the sleeve is suspended from a rotatable eap upon the upper end of the column, a practice heretofore followed. i

The. utilization of removable transmission units atthe head and base of thecolumn` materially reduces oolunm machining as the necessary machining is on the exterior side The assembling of the machine is greatly simplitied as the transmission units can be `fully assembled and tested before the" are installed in the machinel thereby otliering more` arcuracy ,in

hearing alignment'.

Having described my invention. I elaim:

l. In a. radial drill, a column, a sleeve coneentrically and rotatively supported upon and surrounding said column, a cap for said sleeve housing transmission gearing. a seoond housing removably mounted within the base of said coluum and projecting beyond the side ivall of the same,1having transmission gearing therein.and a. shaft extending longitudinally of said lcolumn having splined connection at each end Wit-h a gear of respective transnlission gearings.

:2L In a radial drill, a Column, a sleeve rotatirely mounted upon andconcentrieally surrounding said Column, a. oapt'or said sleeve housing transmission gearing, `a second housing removably mounted within the base of said column and projecting beyond the sidewall of the same, having transmission gearing therein. a shaft extending longitudinally of said column and having splined connection at each end with gears i otf` respect ive transmission gearings, and

means for locking said sleeve to sald Column.

l. In a radial drill. a column, a sleeve concentrieally surrounding said column, a 'ap for said sleeve housing transmissiongeariiug, a ser-ond `liousiifigireinoiuibly mounted within the base of said column having transmission gearing therein, a shaft extending longitudinally of said oolunm and having,r splined connection at each end with gears of respectivel transmission gearings, a bearing at the outer side of said sleeve, and a shaft stepped in said bearing and having splined connection with a gear of the transmission gearing with said cap.

et. In a radial drill, a hollow column having a lateral opening through the base portion thereof, a. device for transmitting motion at an angle. located nnn'ially in the lower portion oit the column, said device being bodily removable through said opening, a shaft in said column connecting with and having its lower end rotatively sustained by said device, and transmission gearingl mounted upon the top of said sleeve enclosing a journaltul gear connectingl with the upper end of said shaft. and rotatively sustaining the upper end of said shaft.

ln a radial drill, a tubularcolumn, having an opening in its lower portion, aP sleeve eomrentrieally surrouiuling said column, rotatively njionnted thereon. a cap upon said steer-e i'orhousing transmission gearing, a :eeond housing attaelied uithin the base of said column having a portion projecting through said openingl and beyond the side wall of said column and having transmission gearing therein, said housing removable through said opening, and a shaft extending longitudiinilly of said column having` splined connection with a gear of the respectire transmission gearings, said shaft translatable within said gears for disconnecting the saine from the lower gear to allow removal of said .second housing` ti. In a radial drill, a tubular columnyhaifing an opening in its lower portion` a sleeve concentrically surrounding said Column, rotatively mounted thereon, a cap upon said sleeve :tor housing transmission gearing, a seeonifl housing attached `wit-hin the. base of said column having a portion projecting through said opening and beyond the side uall of said column and having transmission gearing therein, said housing removable through said opening, a shaft extending longitui'linally of said base having splined connection with a gear of the respective transmission gearings, said shaft translatable within said gears, a` bearing at the outer side of said sleeve, and a shaft stepped in said bearing and haviing` splined connection with a gear of the tramnnission gearing` of said eap.

7. In a radial drillv` a holloiv column :formed with a lateral opening through the lower portion thereof. a sleeve 4rotatively journaled on said column, a transmission unit bodily insertable through said opening and securet'l within said column, having a gearing imlependently.journaleth a transmission unit bodilymounted upon the top of the sleeve 'having a gear independently journaled, a shaft: lengtlivrire within the column having its opposed ends respectively- Cil shaft lengthwise within the Acolumn having I) its Aopposite vendsr respectively connected and journaled with said transmission'units.

9. ln a radial drill, atubular base, hav zing an opening in itslower portion, la sleeve concentrical'ly Vsurrounding said base rotatably mounted thereon, a housing upon said sleeve enclosing Vtransmission gearing, a sec- "ond housing removably attached within said 'base and projecting through said opening and having transmission 'gearing therein,

said housing removable through said opening, a shaft extending .longitudinally within said base having splined connection with a gear of a respective transmission gearing, a bearing at the outer side of said sleeve, and a shaft stepped in said bearing having splined connection with a gear of the transmission gearing of said first mentioned housing.

10. radial drill combining a column, a shaft longitudinally free within said column, a transmissioncasing removably supported within the base of said column, transmission gearing journaled within said casing and a journal support forrotatively supporting said shaft journaled within said transmission casing, said shaft connecting with said transmission gearing.

11. A radial drill combining a column, a shaft longitudinally free within said column, a transmission casing removably supported within the base of said column, a gear journaled within said casing, for connecting with and providing a journal for said shaft, and transmission means mounted upon the top of said column connecting` with and providing a bearing for the upper end of said shaft.

12. A radial drill combining a column, a shaft longitudinally free within said column, a transmission casing` removably supported within the base of said column, transmission gearing journaled within said casing, one element thereof providing a journal for rotatively supporting said shaft, and connecting with said element and transmission means mounted upon the top of said column connecting with and providing a bearing for the upper end of said shaft.

13. A radial drill combining a column, a shaft longitudinally free within said column and having its opposite ends respectively plural splined, a transmission casing removably supported within the base of said column, a gear journaled Within said casing,

for connecting with and providing -a y curnal for said shaft, and transmission means ilounted upon the top of said column connecting with and providingva` bearing for the upper end of said shaft, thespiined ends of said shaft rendering said shaft freely removable longitudinally from said gear and transmission means.

14. A radial drill-combining a column, a shaft longitudinally free withi-nsaid column, a transmission casing removably supported within the base of saidcolumn, a gear jour naled within said casing for connecting 'with and providing -a journal for said shaft, a transmission Vcasing supported upon the 'top of said column, and a gear journaled in said second .casing connecting kwith 1the upper -encl gf said shaft and providing abea-ring thered5. A radial drill lcombining 5a base; -a

column extending therefrom having an'opening 'at the junctureof the 'column :and base; a device for transmitting -motionat an langle 'located normally in the lower portion of said column, said device being bodily removable through said opening; a shaft `iournaled in said column and adapted to be connected with said device; and an external shaft eX- tending parallel with said base and connected within said column with said device.

16. A radial drill combining a substantially horizontal base; a hollow post secured thereto and extending upwardly therefrom and provided at its lower end with a portal; a sleeve rotatably journaled on said post; a radial arm adjustably secured upon said sleeve; a driving shaft extending lengthwise of said base; a driven shaft journaled lengths wise within said p-ostg'a gear-unit bodily insertable through said portal for operatively connecting aid shafts, said gear unit comprising a frame and a plurality of intermeshing gears carried thereby; and means for supporting said gear-unit.

17. A radial drill combining a substantially horizontal base; a hollow post secured thereto and extending upwardly therefrom and provided with a portal; a sleeve rotatn ably journaled on said post; a radial arm adj ustably secured to said sleeve; a driving shaft extending lengthwise of said base; a driven shaft j-ournaled lengthwise within said post; a power transmission unit bodily insertable through said portal and connect-- ing said shafts, said power transmission unit comprising a frame and a plurality of power transmitting elements carried thereby and operatively connected with said shafts and means f-or supporting said power transmission unit upon said base.

18.V A radial drill combining a base provided with a recess; a column extending upwardly from said base and formed with an opening and registry with said recess; a power shaft journaled lengthwise of said UJI base; a driven shaft jonrnaled lengthwise of said column; a gear unit insertable through said opening for operatively connecting said shafts, said gear unit comprising a Jframe and two intermeshing bevel gears one ot which is adapted to be connected to the power shaft and the other of which is adapted to be connectedto the driven shaft and means for supporting said gear-unit with a portion thereof extending into said recess.

19. A radial drill combining a base 5 a post secured to said hase and provided with a portal; a sleeve rotatably journaled on said post and maintained entirely above the plane of said portal; a radial arin vertically adjustable upon said sleeve; a driving shaft extending lengthwise'ot said base; a driven shaft lengthwise of said post; a power transmission unit bodily insertable through said portal after the base and post have been secured together, said t ansmission unit comprising a frame and a plurality ol power transmitting elements operatively connecting said shafts; guides provided by the base tor locating said transmission unit; and means for securing said transmission unit in operative position.

20. A machine tool combining abase formed in its upper surface with a recess providing parallel slide-wa 'sg a post secured upon said base and provired with a portal overlying said recess; a sleeve rotatablyy my naine.

JACK C. CARLTON. 

